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Recently I found out that it's possible to use overlayroot with tmpfs to create stateless readonly root. However I couldn't find any info about limiting the size of tmpfs. Is it possible?

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Yes, you can specify the size of a tmpfs using the size mount option, or the nr_blocks option. With size, you can specify the size in bytes (or kibibytes, or mebibytes, or gibybytes), or as a percentage of installed memory.

The size of a tmpfs can be changed on remount, after the initial setup, so with overlayroot you could reduce the size of the file system by remounting /media/root-rw.

  • Will I have to do it on every boot or can it be done once? – Amomum Apr 19 '17 at 13:44
  • You’d have to do it at every boot. It might work if you add an entry to /etc/fstab with the relevant option (and specify noauto so that overlayroot’s mount works); alternatively, you could add the remount in a startup script. – Stephen Kitt Apr 19 '17 at 13:47

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